:root {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --accent-color: #4fc3f7;
  --header-bg: #1e1e1e;
  --footer-bg: #1a1a1a;
  --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--accent-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

header {
  background-color: var(--header-bg);
  padding: 1.5em;
  text-align: center;
}

.banner h1 {
  font-size: 2.5em;
  margin-bottom: 0.5em;
}

.nav-links {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5em;
}

.nav-links a {
  padding: 0.3em 0.6em;
  border-radius: 5px;
  transition: background 0.2s ease-in-out;
}

.nav-links a:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

main {
  flex: 1;
  padding: 2em;
  max-width: 800px;
  margin: auto;
  text-align: center;
}

footer {
  background-color: var(--footer-bg);
  color: #888;
  text-align: center;
  padding: 1em;
  font-size: 0.9em;
}